Improvement in wipers for blackboards



UNITED STATES PATENT OFFICE.

PHILANDER PERRY, OF WATERFORD, ASSIGNOR TO HIMSELF AND EPHRAIM H.BENDER, OF ALBANY, NEW YORK.

IMPROVEMENT IN WIPERS FOR BLAVCKBOARDS.

Speciiication forming part of Letters Patent No. 36.589, dated September30, 1862.

To all whom, it may concern:

Beit known that I, PHILANDEP. PERRY, of Waterford, Saratoga county,State of New York, have invented a new and useful article of schoolstationary for the purpose of a slate and blackboard wiper; and Ideclare the following specification, with the drawings connectedtherewith as a part of the saine, to be a fulland perfect description ofmy invention. Figure l represents the article as prepared for ablackboard-wiper, and Fig. l2 for a slatewiper.

In Fig. 1 a portion of the covering is shown as removed to exhibit theilling material.

A is an oblong piece of wood, likea clothesbrush handle, of convenientsize for handling, say eight inches long, three and and a half wide, andone inch thick. This is to be covered by a piece of canton-tiennel,(cotton) B, or like material, secured to itby nai/ling along the edgesat O, or any other con'venient mode of attaching it, leaving al spacefor a stuffing or filling, S, between the .wo/od and cover of aboutthree-quarters of'an` inch or au inch. This stufng or filling iscomposed of wood shavings crushed by manipulation, so as to form afriable mass of some elasticity, together with clippings of woolencloth, and for certain purposes with small bits of sponge. Theproportions of these materials may be about equal quantities of shavingsand cloth' mixed together. The sponge,whieh is to be put in whenever therubber is to be wetted, and` and below it at E E, the one side to befilled with shavings and cloth described, the other with cloth andsponge, this latter to be moistened to wash the slateand the other to beused as a drier.

Blackboard-rubbers now in use are simply oblong blocks covered withsheepskin, the

wool outside, or with buckskin. rlhis leather covering soon becomescharged with chalkdust, so that after a short time of use instead offairly cleaning the board it simply covers it with a gray coat, uponwhich writing becomes both difficult and illegible. Besides, the covering operating, as it does, between two unyielding surfaces, nothing but aleathery substance would last any time for a rubber, and even that wearsrapidly ont, requiring-frequent covering to the blocks. The lling-inemployed within my rubbers by its elasticity relieves the pressure andrcdu ees the abrasion, permitting the use of cloth covering, which is acheaper and better article. Further, the cloth (cotton) covering, fromitspeculiartexture, carries off the particles of chalk 'from the boardor slate, instead of grinding it down upon the surface, as does leather.It also allows the use of moisture to clean the board or slate.

Moisture soon rots leather covering, being long retained by it, and notevaporating readily from its pores as from cloth, an importantadvantagein favor of cloth. Ithercfor'e allege that I produce a moreendurable, serviceable, and effective wiper than has ever yet been made,and one that, from the eheapness of its material and construction, meetsthe wants of common schools as a part of its economical apparatus, andis within the reach of all com posed of prepared shavings and clippingsof cloth, with or without pieces of sponge, substantially as described,and for the purposes set forth in the within specieation.

FHILANDER PERRY.

Vitnesses:

E. F. BULLARD, JNO. H.' DENNIs.

